减压精馏塔各类塔板各类塔盘（Vacuum distillation column, tray, tray）.docVIP

减压精馏塔各类塔板各类塔盘（Vacuum distillation column, tray, tray） Vacuum distillation column has few plates, small pressure drop, high vacuum and large diameter. In order to raise the drawing depth as much as possible and avoid decomposition, the vacuum tower should be used to increase the vacuum degree of the vaporizing section as much as possible under the economic and reasonable conditions. Therefore, on the one hand, the tower should be equipped with powerful vacuum pumping equipment, at the same time to reduce the pressure drop of the tray. The pressure reduction tower shall be of a tower with a small pressure drop, usually with a tongue type tray, a mesh tray, a sieve plate tray, a bubble cap, a tray, etc.. The accuracy of the fractionation between the reduced fractions is generally lower than that for atmospheric distillation, so a 3~5 block distillation plate is usually set between the two lateral line fractions of the vacuum column. Under pressure reduction, the volume of oil vapor, water vapor and non condensable gas in the tower becomes larger, and the diameter of the pressure reducing tower becomes larger. They are characterized by: 1. Sieve plate tray: sieve plate tower is a kind of plate tower. It is equipped with several horizontal trays. There are many small holes on the board, such as sieve, and overflow pipe or overflow pipe. During operation, the liquid enters from the top of the tower and passes through the overflow pipe (part of the sieve hole), and the liquid layer is accumulated on the board. The gas (or vapor) enters the bottom of the tower and rises through the liquid layer through the sieve hole and bubbles out so that the two phases can contact and interact with each other. A form of foam contact gas-liquid mass transfer process is superior to bubble cap column. In order to overcome the difficulty of high level plate installation, development circulation plate; overcome the sieve plate appear leakage phenomenon in low load, designed under the plate pl